[<prev] [next>] [day] [month] [year] [list]
Message-ID: <tip-5f2eb55026c91f8400ab4469aff88b2e201b5616@git.kernel.org>
Date: Mon, 24 May 2010 23:07:27 GMT
From: tip-bot for Jan Beulich <JBeulich@...ell.com>
To: linux-tip-commits@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
akpm@...ux-foundation.org, jbeulich@...ell.com,
JBeulich@...ell.com, tglx@...utronix.de, hpa@...ux.intel.com
Subject: [tip:x86/urgent] x86: "nosmp" command line option should force the system into UP mode
Commit-ID: 5f2eb55026c91f8400ab4469aff88b2e201b5616
Gitweb: http://git.kernel.org/tip/5f2eb55026c91f8400ab4469aff88b2e201b5616
Author: Jan Beulich <JBeulich@...ell.com>
AuthorDate: Mon, 24 May 2010 12:13:17 -0700
Committer: H. Peter Anvin <hpa@...ux.intel.com>
CommitDate: Mon, 24 May 2010 13:31:52 -0700
x86: "nosmp" command line option should force the system into UP mode
Bits set in cpu_possible_mask prior to the execution of
prefill_possible_map() (i.e. when parsing ACPI or MPS tables) would
prevent the SMP alternatives logic from switching to UP mode, plus
unnecessary setup of per-CPU data for CPUs that can never come online.
Additionally, without CONFIG_HOTPLUG_CPU disabled CPUs can never come
online, and hence setting cpu_possible_mask bits for them is again a
simple waste of resources.
Signed-off-by: Jan Beulich <jbeulich@...ell.com>
LKML-Reference: <201005241913.o4OJDH3Z010874@...p1.linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
---
arch/x86/kernel/smpboot.c | 26 +++++++++++++++++++++++---
1 files changed, 23 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 763d815..37462f1 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1215,9 +1215,17 @@ __init void prefill_possible_map(void)
if (!num_processors)
num_processors = 1;
- if (setup_possible_cpus == -1)
- possible = num_processors + disabled_cpus;
- else
+ i = setup_max_cpus ?: 1;
+ if (setup_possible_cpus == -1) {
+ possible = num_processors;
+#ifdef CONFIG_HOTPLUG_CPU
+ if (setup_max_cpus)
+ possible += disabled_cpus;
+#else
+ if (possible > i)
+ possible = i;
+#endif
+ } else
possible = setup_possible_cpus;
total_cpus = max_t(int, possible, num_processors + disabled_cpus);
@@ -1230,11 +1238,23 @@ __init void prefill_possible_map(void)
possible = nr_cpu_ids;
}
+#ifdef CONFIG_HOTPLUG_CPU
+ if (!setup_max_cpus)
+#endif
+ if (possible > i) {
+ printk(KERN_WARNING
+ "%d Processors exceeds max_cpus limit of %u\n",
+ possible, setup_max_cpus);
+ possible = i;
+ }
+
printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
possible, max_t(int, possible - num_processors, 0));
for (i = 0; i < possible; i++)
set_cpu_possible(i, true);
+ for (; i < NR_CPUS; i++)
+ set_cpu_possible(i, false);
nr_cpu_ids = possible;
}
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists